Prosecutor Mehran Nassiri said: ‘They came across a Suzuki Swift driving in front of them. The manner of the driving caused the officers to stop the vehicle and they formed the view Miss Brown was under the influence.

‘They invited her to provide a roadside sample. The equipment was not calibrated. So other equipment was brought.

‘The Pc was explaining she had to blow into the tube and she said “I will blow you” and grabbed the officer by the crotch.’

The officer, who cannot be named, told the court they stopped Brown and her male passenger after she nearly crashed into a parked car.

(Picture: Google maps)

He added: ‘Miss Brown was sitting in the driver’s side. The driver’s door was open. I was standing between Miss Brown and the gap in the door.

‘Miss Brown was quite loud. She was joking. She said she had had a pint so what? She found the process quite funny.